| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical element, suppressing generation of unnecessary light to prevent ghost and flare even when imaging an object with high luminance while securing high resolution. <P>SOLUTION: ND filter films Fn1-Fn3 each have a function of decreasing light transmittance, so that the quantity of light of a light beam passing near the inside of the ND filter film Fn1 is maximum, and the quantity of light is reduced in the order of a light beam passing near the inside of the ND filter film Fn2, light of a light beam passing near the inside of the ND filter film Fn3 and light of a light beam passing near the inside of a diaphragm Ms. The outermost diaphragm Ms having substantially zero transmittance exhibits a function as an aperture diaphragm S. <P>COPYRIGHT: (C)2010,JPO&INPIT |
